title: Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction.
abstract: Recently, several groups have reported spin-dependent thermoelectric effects in magnetic tunnel junctions. In this paper, we present a setup for time-resolved measurements of thermovoltages and thermocurrents of a single micro- to nanometer-scaled tunnel junction. An electrically modulated diode laser is used to create a temperature gradient across the tunnel junction layer stack. This laser modulation technique enables the recording of time-dependent thermovoltage signals with a temporal resolution only limited by the preamplifier for the thermovoltage. So far, time-dependent thermovoltage could not be interpreted. Now, with the setup presented in this paper, it is possible to distinguish different Seebeck voltage contributions to the overall measured voltage signal in the μs time regime. A model circuit is developed that explains those voltage contributions on different sample types. Further, it will be shown that a voltage signal arising from the magnetic tunnel junction can only be observed when the laser spot is directly centered on top of the magnetic tunnel junction, which allows a lateral separation of the effects.
authors.affiliation: Thin Films and Physics of Nanostructures, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany. boehnke@physik.uni-bielefeld.de
authors.forename: Alexander
authors.initials: A
authors.lastname: Boehnke
authors.forename: Marvin
authors.initials: M
authors.lastname: Walter
authors.forename: Niklas
authors.initials: N
authors.lastname: Roschewsky
authors.forename: Tim
authors.initials: T
authors.lastname: Eggebrecht
authors.forename: Volker
authors.initials: V
authors.lastname: Drewello
authors.forename: Karsten
authors.initials: K
authors.lastname: Rott
authors.forename: Markus
authors.initials: M
authors.lastname: Münzenberg
authors.forename: Andy
authors.initials: A
authors.lastname: Thomas
authors.forename: Günter
authors.initials: G
authors.lastname: Reiss